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JPH02282793

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH02282793
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
pickup for detecting string vibration of an electric stringed instrument and converting it into an
electric signal, in particular making it possible to clearly reduce noise while maintaining sharp
and clear sound quality. The present invention relates to a pickup for an electric stringed
instrument. 2. Description of the Related Art Generally, in an electric stringed instrument such as
an electric guitar and an electric piano, a pickup for converting a vibration of a string into an
electric vibration is provided. This pickup is roughly classified into two types: an electromagnetic
induction type in which a magnetized pole piece is inserted into a coil, and a piezoelectric
element type constituted by a piezoelectric vibration plate such as a piezoelectric element or a
piezoelectric ceramic. The above two types of pickups have their own unique features, but they
are simple in structure and sound quality. An electromagnetic induction type pickup is used in
most of such stringed instruments because of the low vibration noise and the like. As this
electromagnetic induction type pickup, a structure of a so-called single coil pickup and a
humbucking pickup can be mentioned as a typical example. The single coil pickup has a structure
shown in FIG. That is, the single coil pickup 1 has a configuration in which a magnetic pole piece
3 formed of a rod-like magnet arranged corresponding to a plurality of strings 2 is inserted
through the coil 4. Reference numeral 5 denotes a bobbin of the coil 4 and 6 denotes an outer
case. The principle of this single coil pickup 1 is as follows. The magnetic pole piece 3 always
radiates a magnetic flux from its top to the upper space including the chord 2 as shown by a
broken line, that is, has a magnetic flux opened to the space, and the magnetic substance is filled
with the magnetic material By vibrating the strings 2 formed in the above, the magnetic flux is
changed, and an electromotive force corresponding to the string vibration is generated in the coil
4. In this single coil pickup l, since the string vibration is picked up at one point, the string
vibration mainly composed of harmonic components does not decrease by cancellation as
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compared with the humbucking type pickup to be described later. Although sharp and clear
sound quality can be obtained, since the magnetic flux radiated from the magnetic pole piece 3 is
radiated to the space opened from the top, unnecessary induction noise other than string
vibration is obtained. Also had the drawback of picking up at the same time. This induction noise
is, for example, a lighting device. The cause is induced electromagnetic waves emitted from
transformers, vacuum tubes, radio receivers, etc., and in particular when noise sources are
present in the axial direction of the magnetic pole piece 3, the noise becomes so large that it can
not be ignored at all. Was generated.
In order to reduce this induction noise, the humbucking pickup shown in FIG. 6 has been
developed, and the pickup of this configuration is also widely used as the single coil pickup. The
humbucking pickup 7 is also referred to as a double coil pickup as opposed to the single coil
pickup described above, and two coils 9.9 wound around a bobbin 8.8 disposed adjacent to the
inside thereof. The magnetic pole pieces 10, 10 are pushed through the coil 9.9, and the platelike magnet 11 is provided at the bottom to magnetize the magnetic pole piece 10.10. The coils
9.9 are wound in opposite winding directions, and the top portions of the magnetic pole pieces
10 provided in two rows are arranged to have different polarities. In this humbucking pickup 7,
the two coils 9.9 independently pick up string vibration and induction noise according to the
same principle as the single-fill pickup, but as described above, the two coils 9.9 have reverse
phases. Because of the connection, the induced noise is literally backing or canceled, and the
polarity of the pole piece 10.10 is N, S reversed so that the electromotive force generated by the
string vibration is increased. According to this hampacking pick-up, the induction noise is
suppressed by the above principle, and a powerful and sustain-like output can be obtained
compared to a single coil pickup, but the string vibration is two points because of its
configuration. The emf generated in the two coils 9, 9 will be a slightly different signal, and the
overall output will be a distortion of the combined plus phase of the two different information, In
particular, the string vibration component which is originally required centering on the harmonic
component is also reduced. For this reason, the nose packing pickup has the disadvantage that
the sound becomes muddy compared to the single coil pickup, and the sound quality becomes
too thick and the transparency is impaired. That is, in this kind of electromagnetic induction type
pi, que, 2 b, a pickup that outputs sharp and clear sound is accompanied by unpleasant noise,
and a pickup with little noise is expected to have sharp and clear sound The pick-up that solves
this problem has been strongly sought by players for many years.
SUMMARY OF THE INVENTION It is an object of the present invention to meet the abovementioned needs and to provide a pickup for an electric stringed instrument capable of
outputting a sharp and clear sound with almost no induction noise. DETAILED DESCRIPTION OF
THE INVENTION Embodiments of the electric stringed instrument pickup according to the
present invention will be described in detail with reference to FIGS. 1 and 2 below. In the figure,
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1 and 5 indicate pickups, 2 ░ 2... Indicate strings. This string 2, 2. The both ends of the... Are
respectively anchored to an electric stringed instrument (not shown), such as an electric guitar
tailpiece and a thread winding, and the pickup 15 is attached to the body of the unillustrated
guitar. . The pickup 15 has two bobbins 8.8 disposed adjacent to the inside thereof, and the coils
9, 9 are wound around the bobbins 8.8. The coils 9.9 are wound in different winding directions.
16.16 is a magnetic pole piece. The magnetic pole pieces 16 and 16 are so-called bar-type, made
of plate-like magnetic material having high permeability, and respectively inserted through the
bobbin 8.8. 11 is a magnet. The magnet 11 is provided to magnetize the two magnetic pole
pieces 16 and 16 to the N pole and the S pole, respectively. The magnet 11 is disposed at the
bottom of the pickup 15 and its can diameter is the magnetic pole piece 16.16. Magnetically
coupled to The upper portion 17.17 of the magnetic pole pieces 16, 16 is curved in a
substantially semicircular shape, and the magnetic flux radiated from the magnet 11 is
substantially indicated by a broken line as shown by two magnetic pole pieces 1, 6, 16 In order
to make the magnetic flux closed only in the upper space of the upper and lower poles, the N
pole and the S pole of the top 18.18 thereof are arranged close to each other with a slight gap.
Further, the tip of the top 18 ░ 18 is formed in the shape of a knife in order to prevent the
leakage flux as much as possible. 19 is a damping plate. The damping plate 19 reliably maintains
the gap so that the magnetic pole pieces 16 and 16 are not magnetically short-circuited, and
unintentionally generates magnetic poles due to string vibration, body vibration, feedback
vibration from an amplifier, etc. It is provided to prevent the piece 16.16 from vibrating and the
pickup itself generating unnecessary noise. Next, the operation of the above embodiment will be
described. The magnetic pole pieces 16 and 16 are magnetized because they are coupled to the
magnet 11 and have N poles at their tops 18.18 respectively.
The magnetic force of the south pole is generated. This magnetic force is emitted from each of
the tops 18 ░ 18 but since the tops 18 and 18 are closely spaced with a slight gap, their flux is
substantially two as shown by the broken lines in FIG. The magnetic flux is closed only in the
upper space of the magnetic pole pieces 16 and 16. When playing the guitar, the strings vibrate
in the closed magnetic flux. The vibration of the strings changes the magnetic flux, and an
electromotive force corresponding to the string vibration is generated in each of the coils 9 and
9. The closed magnetic flux does not in principle enter an external induction magnetic flux that
causes noise, but if it does, the coil 9.9 is wound in a different direction, that is, reverse phase
connection This induced noise signal is also because it picks up the string noise as well as the
string noise at one and the same point in the same closed magnetic flux, i.e. coil 9.9 is in two
positions as described above. The two coils 9, 9 have substantially the same backing, i.e., a
backing effect, since they have the same antiphase signal. The range of the closed magnetic flux
is set by the gap size of the tops 18.18 of the two magnetic pole pieces 16,16. Therefore, the gap
size of the top 18.18 is the same as that of the pickup 15 and the chord 2.2. иииииииииииииии Determined
by the interval with Next, a second embodiment of the present invention will be described in
detail with reference to FIG. 3. The same reference numerals as in the first embodiment denote
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the same parts as in the first embodiment, and a description thereof will be omitted. In the figure,
21 shows a pickup. The pickup 21 is disposed adjacent to each other, and two coils 9 and 9
wound in different winding directions, and the coils 9.9 are respectively inserted, and their tops
22 and 22 have different polarities. And magnetic pole pieces 23, 23 arranged as described
above. The magnetic pole piece 23.23 has an upper portion 17.17 so that the magnetic flux
radiated from the top 22.22 is substantially closed only in the upper space of the two magnetic
pole pieces 23, 23. Is curved in a substantially semicircular shape so that its top 22.22 can be
arranged closely with a slight gap. Further, in the top 22.22, in order to widen the magnetic flux
space, a downwardly extending slope portion 24.24 having a predetermined angle with respect
to the extension direction of the chord 2 is formed. The operation of this embodiment is the same
as that of the first embodiment, and therefore the explanation thereof is omitted. However,
according to this embodiment, the sloped portion 24.24 which spreads downward on the top
22.22 of the magnetic pole pieces 23 and 23 is omitted. Since it is formed, the distribution range
of the closed magnetic flux acts to expand as compared with the first embodiment.
This is due to the principle of magnetism that magnetic fluxes emitted from a plane form a
magnetic flux returning to the plane of the other pole. The range of the closed magnetic flux in
the present embodiment is set by the gap size of the top 18.18 of the magnetic pole piece 23, 23
and the angle of the slope 22.22. Next, a third embodiment of the electric stringed instrument
pickup according to the present invention will be described in detail with reference to FIG. 4. The
same parts as those in the first embodiment are indicated by the same reference numerals and
the explanation thereof is omitted . The present embodiment is an example in which the function
of a separate type pole piece is added to a par type pole piece. In the figure, 25 is a pickup. The
cross section of this pickup 25 is formed identical to the cross section of FIG. 3 described in the
second embodiment. 26.26 is a magnetic pole piece formed in a bar type. The tops 27.27 of the
magnetic pole pieces 26 and 26 are disposed in the same manner as the tops 22 and 22 of the
magnetic pole pieces 23.23 in the second embodiment, and are disposed adjacent to the strings
2, 2. Are formed inclined surface portion 28.28 of the lower extent with respect stretched
direction ....... Also, the top 27.27 has a string 2, 2. Downwardly extending slope portions 29. 29
corresponding to the vibration direction of... Next, the operation of this embodiment will be
described. Also in the present embodiment, the magnetic force radiated from the magnetic pole
pieces 23 is substantially closed by the upper space notch of the two pole pieces 23.23 by the
same action as the first and second embodiments. It becomes magnetic flux. In addition, since the
slopes 28. 28 corresponding to the vibration direction of the 2.2 ░.... Are formed on the tops 27.
27 of the magnetic pole pieces 23 and 23, the magnetic flux is generated by the 2.2. Drawing a
semicircle with respect to the vibration direction of the ...... (it is distributed so. That is, the strings
2, 2, 2.. In the direction of vibration, the magnetic flux distribution is the same as that of the
separate type pole piece. In the description of the above embodiment, the upper part of the
magnetic pole piece is processed into a substantially semicircular curved surface so that the top
of the magnetic pole piece is approached by way of example. However, the present invention is
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not limited to this. The tops of the pieces may be configured to be close to each other by, for
example, bending them in a crank shape. Moreover, although the thing of the structure which
provided the damping board between magnetic pole pieces was demonstrated, this may be
abbreviate | omitted, and also the main body itself will have a damping effect by molding the
whole pickup. May be used.
Further, in the description of the embodiments, although the pole piece of the U-type has been
described as an example in any of the examples, the invention is not limited to this, and a
magnetic pole piece of a separate type may be used. Furthermore, although the magnetic pole
piece demonstrated the example of the structure magnetized by the magnet, you may form
magnetic pole piece itself with a magnet. In the embodiment, although an example applied to an
electric guitar as an example of an electric stringed instrument has been described, the present
invention is not limited to this, and an instrument for converting string vibration into an electric
signal like an electric piano It may be applied to any stringed instrument. (Effects of the
Invention) As apparent from the above description, according to the pickup for an electric
stringed instrument of the present invention, the magnetic force radiated from the magnetic pole
piece substantially corresponds to the upper space of the two magnetic pole pieces, that is, the
position where the strings exist. Since the magnetic flux is closed only in the vicinity and the
external induction magnetic flux causing the induction noise is not picked up, it has an effect of
obtaining an electromagnetic induction type pickup with significantly less noise as compared
with the conventional open magnetic pickup. . Also, if inductive noise is generated, however, the
inductive noise signals generated in the two coils are completely identical and opposite in phase
because this inductive noise is also picked up in the magnetic flux closed together with the string
vibration, that is, at one point. Therefore, inductive noise has a backing effect that is substantially
completely eliminated without residual noise due to positional phase distortion occurring in the
two conventional types of pickup. Furthermore, since the pickup for an electric stringed
instrument according to the present invention is basically a configuration of a humbucking
pickup, since there are one point for picking up the vibration of the string, the chord vibration is
picked up at two places like a conventional humbucking pickup. In particular, since the string
vibration centering on the high frequency component, which has been generated in the second
type, is not canceled out by the cancellation, it has an effect that an extremely sharp and clear
sound quality can be obtained. Further, according to the pickup for an electric stringed
instrument of the present invention, since the magnetic flux is substantially closed only in the
upper space of the magnetic pole piece, it loops to the N pole and the S pole generated in the
conventional open flux type. Since the current is also eliminated by the magnetic flux, the
reduction of the high frequency component also has an effect to obtain clear sound quality
further suppressed. In particular, when a damping plate is provided between the tops of the
magnetic pole pieces arranged close to each other as in the embodiment, the magnetic insulation
between the magnetic pole pieces is ensured, and string vibration, body vibration, The magnetic
pole piece vibrates due to feedback vibration from the amplifier and the pickup itself may
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generate unnecessary noise.
Further, as described in the first and second embodiments, when the top portion of the magnetic
pole piece is processed by curving the upper portion into a substantially semicircular shape to
make the top portion close, the magnetic attenuation rate decreases and the top portion Even if
they are brought close to each other, it is possible to obtain a pickup with less output
deterioration. Furthermore, by forming the tip in the shape of a nose, it has a practical effect that
it is possible to obtain a high efficiency pickup with little leakage flux. Further, as in the second
embodiment, a sloped portion extending downward with respect to the string extending direction
is formed on the top of the magnetic pole piece, and the range of the closed magnetic flux is
expanded because the range of the closed magnetic flux is expanded. The distance to the pickup
has the effect of being able to be relatively separated. Further, in the case of the configuration as
in the third embodiment, the magnetic flux is closed not only in the string extending direction but
also in the string vibrating direction, so that the influence of the other adjacent strings is
reduced. The pickup has an effect that can be theoretically ideal.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a perspective view showing a first embodiment of a pickup for an electric stringed
instrument according to the present invention, FIG. 2 is a cross-sectional view taken along the
line-of FIG. 1, and FIG. 3 is a second embodiment. FIG. 4 is a front view partly in cross section
showing the third embodiment of the present invention.
5 and 6 are sectional views showing an example of a conventional pickup for an electric stringed
instrument. ???? иииииииииииииииииии L 9, 9 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Magnetic Pole
piece 17.17 ииииииииииииииииии part, 18 ░ 18 иии и и и и и и и и и и и и Damping plate, 21 и и и и и и и и и и и и и и и 22 22 и и и
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
Magnetic pole piece, 27 .27 ... top ... 2 g, 28. ..., ...... slope portion, 29.29 ..., ...... slope portion.
Patent applicant Myster Technology Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4
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